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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04154579d3933990b679710adcc886cb8c13b443d5b999342dd968073efc1f44' 
  AND token = '0Z8DUAmTIAL2YEVOUu0Fj8oJQ0YqiZ9J2OpnpHplr5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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