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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0d6922805a61b48fd6a2d2c87a5784059a1110d3c09ba843efb80320a72d7d' 
  AND token = '85Kp+k8ILNTqMRhoMu2L8swg6/ieuywDWTZ7MjjAip4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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