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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a00f69aa27a85639f78858a8ec891d25e92ed87588b47c98041e9278280ef0f' 
  AND token = '1vf6t9m0PzIfHyLbWx5OltYAvJ8sIvSzCiv2HW5v3xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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