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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c326944b49c6f95ec3d7b1a2399cbcf92eca144a0acbefcf0e392c92977723e' 
  AND token = 'dQBrLclQM/0KSQ8iqPmLegKvsvChJRRJR0Cm70LYL/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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