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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f56096bac37d74400b4bd5868208fb8164c9b1fcc0be0f7d9fe5e2f795c50d' 
  AND token = '34U5VDdt4lDnw5jg2/KzqKaLQmjHccbwxsaybmDQ1GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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