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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df3dab236627bd6c4c54e78bc57df22a6d492735daa5448c065e91776d72472' 
  AND token = 'AJaPQRJidP8+AAaUV82tIhJZM97Hkf2DbYU1+C1kRWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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