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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8883c64e7309c1bdafe84c27502d489a45d3dc9eae8b3a208c4a98d83afe60e1' 
  AND token = '7WgRBMaevh0gqRmfJntzCla4F8R4vMECo863a/q5SMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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