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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5c9a589ce4767ddb55e5d18ba4c867d4f746bf5c33d672c6298511a4989cbb' 
  AND token = '3M0U0MSEurhDrYlbA1wa7FHES9BqbhnDpdHRJ1JZO94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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