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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c9bc192d0a42c3ee66e6f53180fe221516192c216bbb2d568cb7d612cdfc1a' 
  AND token = 'wRsYcfDT8hg+sP4ApNs44mHghrCGuVmcQn9CD285MoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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