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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abedfd9ba975e92d70e10512e9ef2566be6504c38c91830adc86bbe2882e935' 
  AND token = 'VLDi3R2N2XQTGqozfBY+Jw2ZBjBX0k9hd1SFzVDVkSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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