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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee99f9661ccc09e59a175e21eb69f1d4d4200b12b924b72447eadd6064f14462' 
  AND token = 'Bs/t6IseLQqGqACMuDz3Jp3DOxd0r0DpcvGzjg72728=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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