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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e50e3e31c5e7faf631de4667acab1ca2f1ff05f2f412435882bee06b360764' 
  AND token = 'F04H8xVcGtZz51sH3aw7tBCLfmnHHy4f+Y4TVIyZjYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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