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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afa8216dcd41d8a97ff417bf05a9237ed8cf570fd3f295d5d6385e32ee38553' 
  AND token = 'OKdl0DBoUWbhuShuzNibFlsBAKSL/VfV6paaowQzBiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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