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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ab13ca5bed86829fca3e1e05bf53091b6c1faeb4a00627a41cb41fd27d0351' 
  AND token = '1z9WBt7ubI7rD4ON/VwINbuj7v3lntX1jR9hRRhz72s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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