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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0029f6018096091f2c01c6243ff6e8ae2267fbb3b4f9676648b36b3f2fc89d92' 
  AND token = '74pnxGFTCENnEPAiA4M6yHRDOalTecHoRL8dHkQ1k00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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