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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e9c6f8b402b2124005b469116159906a1cba4de1c0b2fe8fd590b5e81222b3' 
  AND token = '9vIFOj7AIH4RIxvIOEY0htJV9z11HI8LD87uqBVnIVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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