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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef081edf642ceb5a0ac29340c4a6e012130f4d0790704bd987dccab34b77aa8e' 
  AND token = 'g4/X2avcJljFt7BF3bmnW+drd9Fk9g14Buh3z2z1I90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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