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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc486a4c2247f87262d7b3e93c9b1cc9cfaef4af2eb673ef4cb2915556ef5133' 
  AND token = 'tyhEdMxvGFlClQ+W1F7TUY/jMLndrAtqujoutawvcAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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