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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4e745c6e422fffebc9d35821cef00cd17284675274b1f6b28bd6944bd185e8' 
  AND token = 'YBUckyjyeUmzfEGVW5hfM1BvqZu2GrN4O9edOIld400=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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