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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faff9cbce332fbbcd8b8514aa799acaeb96f201d4bea096a9e265323e3e38763' 
  AND token = 'X4E9VPY3yzNcvuoOW5OZp6lCbjzM3FhLeIwo7KUnMl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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