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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e79157db15448263d52341187a265ebfccd929d809a150b22b356de512c7d1' 
  AND token = 'gc7A9PrMN30PbuQryFoLRon2ersszD0nK18FnQuPX58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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