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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19285f0c826558ea989d4d51f7972e644009a713aa1aeb3a25dd83e6d9b376bc' 
  AND token = 'FoyHaT8ol1vs8fva84YxuGEglc5pS0U+g4SGMulPCdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}