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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62267303fcecd6ad090391981d682cdd63f3319f59a8d90daa2c33e63dc8bc58' 
  AND token = 'I8Ooeql8LJJRHK1aFiJdPS41XFrIvqgVeDQ5LzINmXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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