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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b2e29bfd6107523accedf5315dafb6dc60ddafa870e0a431d774a5c2f33d84' 
  AND token = 'Wojm2mURg+mDMteb7DhI/u4KeoNDjT4/SX7DeAx3Zkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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