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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096bbc612e488f98d8aca7a0a04f944fe6fc193ad058e945cbf7d1c6a06b22f6' 
  AND token = 'JzRsdWdvqnVBq7y+FH522+OD6Y9LEoWkjMzTH14e9qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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