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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6762d269ca697aea3f3d378a8d340039d10c9ac37b7153a5d38a64095d1faa2b' 
  AND token = 'ATpbPM9wnGlIOwAuKRO9h/EGiwX+eAtNat1n9VOtazI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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