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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e6ddcb7ffe057ff2491d6744d193032b5f0e20d5ffda66e2d9ef315dc64708' 
  AND token = 'dVD7oigmJ4xA7vBG/Oublg7EldGXz5kvVCvPY5dqAE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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