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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3f7662ccec0ea8c07fae6ed78c1c58fa80edf95480f284b5e270f440da5f2a' 
  AND token = 'bC1Jyry9cv3PT4qkDlVodSMYYNaM6NveBm1Ha09YmlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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