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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f14204dfb4be1746e312bd3a80b283adf64567ce649be2fdee4466872565b62' 
  AND token = 'sEwZaCAPJrSU+0542aKtT2aNe3GEeTUahq07/DToBTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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