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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93b02e825cf0d3e200d43c78857789f22347a2f1bc04073a42623bec08e2eb7' 
  AND token = 'g977Bhc9Ik82key7OCm5COs3l6H3zn03FhZ5+X091is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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