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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4637ac3ab9ca9167f26ea07d25b36b97fd59756f595d0f11177c3d59f02328e6' 
  AND token = 'yYn4rBhm1lHP1P3bnchP1Ok0ZRTJom1YDFm+KJQJtb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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