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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367fc467a8c22ea2999d7104a7a2ffb80e91f8356866a845a409ede3d9c2636e' 
  AND token = 'Vr+3+HyhFsr7l0kaZgW1FaMTPrkq9TeOE9Qi6dsL1fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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