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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c107c47419e357c74df0c712a697f5074c2d240587c39bb9a5575d3e411b976' 
  AND token = '2cv4+6lrz+Y9wnfhdPdy+2R48dBWtsUenI1y5lWe3s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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