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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c99d868952e762cae66c5f2a9f33d7716025f8877baab93eff1cf4ce6ec85e' 
  AND token = '4L+WsuECWh5Y0fAo9GktSvQbtjMF2RlotGnwstbqS7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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