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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93580fc0a02cebb57132a233add77403b6e572ed209817230838e98049f7bac6' 
  AND token = 'UDjsb8eN7dQ5EXBQkxVlCm65W6p4mVrVQCvNnLNdqxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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