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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69ac3a91e1c40aad6aba19d3f5fa953b90adaf4f47abb9fd6a413f7bf51826d' 
  AND token = 'bw1DfAr9hRHwx3WBcVR/emu9DpqMaPG2plt6XkHiA4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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