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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e14845871682f418e8db0787f4561fcd8e31d26c9beb7a6c470f74699a4f2e5' 
  AND token = 'OCbSCqZbDw85wMbeOrDhdwEjZm8djkxov+XCTifQ+bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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