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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3d2340f2cba4b19663f02454fc6dbf38e76556f695264a9073cd4397418dc3' 
  AND token = 'EBxNV4UNCzrDI7VRvshmMupQH9lL69TyrpNOiqyWJBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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