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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d22917964e9ee9c9be536a520e0ed9e81a8ff6146e967dbac7cc5439989ee00' 
  AND token = 'C2eZAksiXuH2dR2IbjW7JhBIMDSvMgMCZ/WylemCd1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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