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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604c7dab61a542ac168055b5ca2fa5ad55f923961acd5a37447e72539254a6c0' 
  AND token = 'T335IrVDiXrcIQYKg//O3FuiTKOfhb6Xu2QG7KN5ZPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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