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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818b94eec30d2fdacf3615d911f94084e3d655b097f0f436a065bcfaee922607' 
  AND token = 'gCxILYFOTaPpkgDOtw8H5i0IWZl5IYBPJ+BeM9z98zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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