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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e33b0bf9d73a0bfa5ec28afd1feb1d5b43a95ae9fab4c3cf9787601fec3f895' 
  AND token = 'HH0JrcZVSr4BjJrUo0UojgCsl/bJp4+JSuoFFXJY+5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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