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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b6e3559a10742a66343293b8f3c4e523f0c772a005abb789d7340ccee29f0c' 
  AND token = 'bSSYHof/BO/l0DJ4wn0A7N07yphae8LqspT1z75e7jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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