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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691fa6966a687108f40d18c1066c6761cc44ba7f90d19add46f41dc85b34520f' 
  AND token = '4vmXFOR08H2H/AQqhxlpvqjWy43mIRrHXZYM2A6hUVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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