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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a094278fa8299206af96484b2a5d5253068eab0065c1cc57d7ef59f0305bfe34' 
  AND token = 'wwq/pb6J9vziwyB1RELFn5Ic36cfoUfYCXikTkcHWKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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