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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a98ff7c3e7ac43e1a728d8abca8d8496dae1ad0a5c4ef4048fcc753694894e' 
  AND token = 'jA/siEoDC1x5Ez8Jt82jPjgi50+r7hD612PoUK0p8Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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