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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb789012733006cff7025a01d3cf8895826bc394dc1ef6a5546afc621361f60d' 
  AND token = 'IZRIW7FA+FeJWZFW0mvLnB1iaM3AA7bU1KjN3fBAMqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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