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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254bfa3cecc4d86fe80ca02d48d51f2a9b10d88f7d054db5e1402c94d5690b34' 
  AND token = 'MFLyYCK8hbP60+POMdU8y+ohMniSjroH27+vF+JoM10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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