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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00cd7b79fac13e8a41b8323454100d8621fa0c06625a1f55ef0f836fe31c94e' 
  AND token = 'pgAuxJauWrlBc0oPd7v+wc7neKIf0l/3+KiuIV7YdBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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