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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6beea0fe17f65c041ab92dabe983d5a51a296b8df73855cf9cedeb6ee32cd5' 
  AND token = 'arpiMOFJtUOiLMYjGOtufnAo5/OCZwPfmtnmw4kpPXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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