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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba0db89330966e389d37de982883b81196ffcd0ad248877d964293f1c3bc3c0' 
  AND token = 'cHW1Df2FuxHD7SDF7f/91EsWoDTpjEFZwFbpEVrsarc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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