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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d4742e64362d18ea87e92bb7f1f8a89a1d2c1dd8cc191c2b112c879047894e' 
  AND token = 'PCA8vwZJVIXyvYRTIFW64DOq6VJC7e1R5p6prhS9PjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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