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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d1afffb365ce8c44ac91ec9bea40536d3c09892203b9ae384bf279e2f55887' 
  AND token = 'evNkx1ZvVNICBa5PNu+4Ny6Fcp6Qf3/c0cbeY2QHAmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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