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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0e4ade45d0b3ea026ddcfcc8c44b191fc2008200de00e794531af2953be967' 
  AND token = 'LQ4LFJyGPu2GyBX+gMBROvTvc+QaKNgZQD3E66JuIio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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