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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d82ad963d5a7550bfaa6f07f5fd3e5e127b48717322b0659ef9a5bcac6d3bb' 
  AND token = 'AW9GlkdCBLPEOsTQwZy38NFnpMBXawN04E3595OQmLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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