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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0390d5622d311d8c377cc87f47ab40f95a4cba41125ae1642e2f4f441c6c7a28' 
  AND token = 'H3gGF5E9uVAUNnel0pCPAC2GmrQSQiPFH659Z695z1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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