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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf84cf5a92552cdf15d54de4a6807979d3cd26df75748bde19d83bdfa391c73' 
  AND token = 'H3exY+p2S1G5hfzksj2eANbbf3IxT3cqQbmcorpN2gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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