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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06995edc3b9840254393cceee52cae0ca9793db89ea94327bdb5693c9d46c527' 
  AND token = 'YQwlFS+r/Kj4HfT9VKXqMFy+vnkvmPGtYR+DEx027qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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