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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8895d2b3c57b16d631739ae851570f9ad4d735b2d000abb407cc0c2c8816bb' 
  AND token = 'hXJWACu/qQeI2Gem5C8B3Ofo43XAYzCtHk8b+2P8ClY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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