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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41fe7dd6481d4ce2d91b87cd67e1b7bf3dab1686f4717b8a4a0a1c0969f6bac' 
  AND token = 'BoYTQ4fhhBzXxhvUtsZcD6bDr8lzN6ZuyW19TGnVHU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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